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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "public/fpdf_ppo.h"
#include <memory>
#include "fpdfsdk/include/fsdk_define.h"
#include "third_party/base/stl_util.h"
class CPDF_PageOrganizer {
public:
using ObjectNumberMap = std::map<FX_DWORD, FX_DWORD>;
CPDF_PageOrganizer();
~CPDF_PageOrganizer();
FX_BOOL PDFDocInit(CPDF_Document* pDestPDFDoc, CPDF_Document* pSrcPDFDoc);
FX_BOOL ExportPage(CPDF_Document* pSrcPDFDoc,
std::vector<FX_WORD>* pPageNums,
CPDF_Document* pDestPDFDoc,
int nIndex);
CPDF_Object* PageDictGetInheritableTag(CPDF_Dictionary* pDict,
CFX_ByteString nSrctag);
FX_BOOL UpdateReference(CPDF_Object* pObj,
CPDF_Document* pDoc,
ObjectNumberMap* pObjNumberMap);
FX_DWORD GetNewObjId(CPDF_Document* pDoc,
ObjectNumberMap* pObjNumberMap,
CPDF_Reference* pRef);
};
CPDF_PageOrganizer::CPDF_PageOrganizer() {}
CPDF_PageOrganizer::~CPDF_PageOrganizer() {}
FX_BOOL CPDF_PageOrganizer::PDFDocInit(CPDF_Document* pDestPDFDoc,
CPDF_Document* pSrcPDFDoc) {
if (!pDestPDFDoc || !pSrcPDFDoc)
return FALSE;
CPDF_Dictionary* pNewRoot = pDestPDFDoc->GetRoot();
if (!pNewRoot)
return FALSE;
// Set the document information
CPDF_Dictionary* DInfoDict = pDestPDFDoc->GetInfo();
if (!DInfoDict)
return FALSE;
CFX_ByteString producerstr;
producerstr.Format("PDFium");
DInfoDict->SetAt("Producer", new CPDF_String(producerstr, FALSE));
// Set type
CFX_ByteString cbRootType = pNewRoot->GetStringBy("Type", "");
if (cbRootType.Equal("")) {
pNewRoot->SetAt("Type", new CPDF_Name("Catalog"));
}
CPDF_Object* pElement = pNewRoot->GetElement("Pages");
CPDF_Dictionary* pNewPages =
pElement ? ToDictionary(pElement->GetDirect()) : nullptr;
if (!pNewPages) {
pNewPages = new CPDF_Dictionary;
FX_DWORD NewPagesON = pDestPDFDoc->AddIndirectObject(pNewPages);
pNewRoot->SetAt("Pages", new CPDF_Reference(pDestPDFDoc, NewPagesON));
}
CFX_ByteString cbPageType = pNewPages->GetStringBy("Type", "");
if (cbPageType.Equal("")) {
pNewPages->SetAt("Type", new CPDF_Name("Pages"));
}
CPDF_Array* pKeysArray = pNewPages->GetArrayBy("Kids");
if (!pKeysArray) {
CPDF_Array* pNewKids = new CPDF_Array;
FX_DWORD Kidsobjnum = -1;
Kidsobjnum = pDestPDFDoc->AddIndirectObject(pNewKids);
pNewPages->SetAt("Kids", new CPDF_Reference(pDestPDFDoc, Kidsobjnum));
pNewPages->SetAt("Count", new CPDF_Number(0));
}
return TRUE;
}
FX_BOOL CPDF_PageOrganizer::ExportPage(CPDF_Document* pSrcPDFDoc,
std::vector<FX_WORD>* pPageNums,
CPDF_Document* pDestPDFDoc,
int nIndex) {
int curpage = nIndex;
std::unique_ptr<ObjectNumberMap> pObjNumberMap(new ObjectNumberMap);
int nSize = pdfium::CollectionSize<int>(*pPageNums);
for (int i = 0; i < nSize; ++i) {
CPDF_Dictionary* pCurPageDict = pDestPDFDoc->CreateNewPage(curpage);
CPDF_Dictionary* pSrcPageDict = pSrcPDFDoc->GetPage(pPageNums->at(i) - 1);
if (!pSrcPageDict || !pCurPageDict)
return FALSE;
// Clone the page dictionary
for (const auto& it : *pSrcPageDict) {
const CFX_ByteString& cbSrcKeyStr = it.first;
CPDF_Object* pObj = it.second;
if (cbSrcKeyStr.Compare(("Type")) && cbSrcKeyStr.Compare(("Parent"))) {
if (pCurPageDict->KeyExist(cbSrcKeyStr))
pCurPageDict->RemoveAt(cbSrcKeyStr);
pCurPageDict->SetAt(cbSrcKeyStr, pObj->Clone());
}
}
// inheritable item
CPDF_Object* pInheritable = nullptr;
// 1 MediaBox //required
if (!pCurPageDict->KeyExist("MediaBox")) {
pInheritable = PageDictGetInheritableTag(pSrcPageDict, "MediaBox");
if (!pInheritable) {
// Search the "CropBox" from source page dictionary,
// if not exists,we take the letter size.
pInheritable = PageDictGetInheritableTag(pSrcPageDict, "CropBox");
if (pInheritable) {
pCurPageDict->SetAt("MediaBox", pInheritable->Clone());
} else {
// Make the default size to be letter size (8.5'x11')
CPDF_Array* pArray = new CPDF_Array;
pArray->AddNumber(0);
pArray->AddNumber(0);
pArray->AddNumber(612);
pArray->AddNumber(792);
pCurPageDict->SetAt("MediaBox", pArray);
}
} else {
pCurPageDict->SetAt("MediaBox", pInheritable->Clone());
}
}
// 2 Resources //required
if (!pCurPageDict->KeyExist("Resources")) {
pInheritable = PageDictGetInheritableTag(pSrcPageDict, "Resources");
if (!pInheritable)
return FALSE;
pCurPageDict->SetAt("Resources", pInheritable->Clone());
}
// 3 CropBox //Optional
if (!pCurPageDict->KeyExist("CropBox")) {
pInheritable = PageDictGetInheritableTag(pSrcPageDict, "CropBox");
if (pInheritable)
pCurPageDict->SetAt("CropBox", pInheritable->Clone());
}
// 4 Rotate //Optional
if (!pCurPageDict->KeyExist("Rotate")) {
pInheritable = PageDictGetInheritableTag(pSrcPageDict, "Rotate");
if (pInheritable)
pCurPageDict->SetAt("Rotate", pInheritable->Clone());
}
// Update the reference
FX_DWORD dwOldPageObj = pSrcPageDict->GetObjNum();
FX_DWORD dwNewPageObj = pCurPageDict->GetObjNum();
(*pObjNumberMap)[dwOldPageObj] = dwNewPageObj;
UpdateReference(pCurPageDict, pDestPDFDoc, pObjNumberMap.get());
++curpage;
}
return TRUE;
}
CPDF_Object* CPDF_PageOrganizer::PageDictGetInheritableTag(
CPDF_Dictionary* pDict,
CFX_ByteString nSrctag) {
if (!pDict || nSrctag.IsEmpty())
return nullptr;
if (!pDict->KeyExist("Parent") || !pDict->KeyExist("Type"))
return nullptr;
CPDF_Object* pType = pDict->GetElement("Type")->GetDirect();
if (!ToName(pType))
return nullptr;
if (pType->GetString().Compare("Page"))
return nullptr;
CPDF_Dictionary* pp = ToDictionary(pDict->GetElement("Parent")->GetDirect());
if (!pp)
return nullptr;
if (pDict->KeyExist((const char*)nSrctag))
return pDict->GetElement((const char*)nSrctag);
while (pp) {
if (pp->KeyExist((const char*)nSrctag))
return pp->GetElement((const char*)nSrctag);
if (!pp->KeyExist("Parent"))
break;
pp = ToDictionary(pp->GetElement("Parent")->GetDirect());
}
return nullptr;
}
FX_BOOL CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj,
CPDF_Document* pDoc,
ObjectNumberMap* pObjNumberMap) {
switch (pObj->GetType()) {
case CPDF_Object::REFERENCE: {
CPDF_Reference* pReference = pObj->AsReference();
FX_DWORD newobjnum = GetNewObjId(pDoc, pObjNumberMap, pReference);
if (newobjnum == 0)
return FALSE;
pReference->SetRef(pDoc, newobjnum);
break;
}
case CPDF_Object::DICTIONARY: {
CPDF_Dictionary* pDict = pObj->AsDictionary();
auto it = pDict->begin();
while (it != pDict->end()) {
const CFX_ByteString& key = it->first;
CPDF_Object* pNextObj = it->second;
++it;
if (!FXSYS_strcmp(key, "Parent") || !FXSYS_strcmp(key, "Prev") ||
!FXSYS_strcmp(key, "First")) {
continue;
}
if (pNextObj) {
if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
pDict->RemoveAt(key);
} else {
return FALSE;
}
}
break;
}
case CPDF_Object::ARRAY: {
CPDF_Array* pArray = pObj->AsArray();
FX_DWORD count = pArray->GetCount();
for (FX_DWORD i = 0; i < count; ++i) {
CPDF_Object* pNextObj = pArray->GetElement(i);
if (!pNextObj)
return FALSE;
if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
return FALSE;
}
break;
}
case CPDF_Object::STREAM: {
CPDF_Stream* pStream = pObj->AsStream();
CPDF_Dictionary* pDict = pStream->GetDict();
if (pDict) {
if (!UpdateReference(pDict, pDoc, pObjNumberMap))
return FALSE;
} else {
return FALSE;
}
break;
}
default:
break;
}
return TRUE;
}
FX_DWORD CPDF_PageOrganizer::GetNewObjId(CPDF_Document* pDoc,
ObjectNumberMap* pObjNumberMap,
CPDF_Reference* pRef) {
if (!pRef)
return 0;
FX_DWORD dwObjnum = pRef->GetRefObjNum();
FX_DWORD dwNewObjNum = 0;
const auto it = pObjNumberMap->find(dwObjnum);
if (it != pObjNumberMap->end())
dwNewObjNum = it->second;
if (dwNewObjNum)
return dwNewObjNum;
CPDF_Object* pDirect = pRef->GetDirect();
if (!pDirect)
return 0;
CPDF_Object* pClone = pDirect->Clone();
if (!pClone)
return 0;
if (CPDF_Dictionary* pDictClone = pClone->AsDictionary()) {
if (pDictClone->KeyExist("Type")) {
CFX_ByteString strType = pDictClone->GetStringBy("Type");
if (!FXSYS_stricmp(strType, "Pages")) {
pDictClone->Release();
return 4;
}
if (!FXSYS_stricmp(strType, "Page")) {
pDictClone->Release();
return 0;
}
}
}
dwNewObjNum = pDoc->AddIndirectObject(pClone);
(*pObjNumberMap)[dwObjnum] = dwNewObjNum;
if (!UpdateReference(pClone, pDoc, pObjNumberMap)) {
pClone->Release();
return 0;
}
return dwNewObjNum;
}
FPDF_BOOL ParserPageRangeString(CFX_ByteString rangstring,
std::vector<FX_WORD>* pageArray,
int nCount) {
if (rangstring.GetLength() != 0) {
rangstring.Remove(' ');
int nLength = rangstring.GetLength();
CFX_ByteString cbCompareString("0123456789-,");
for (int i = 0; i < nLength; ++i) {
if (cbCompareString.Find(rangstring[i]) == -1)
return FALSE;
}
CFX_ByteString cbMidRange;
int nStringFrom = 0;
int nStringTo = 0;
while (nStringTo < nLength) {
nStringTo = rangstring.Find(',', nStringFrom);
if (nStringTo == -1)
nStringTo = nLength;
cbMidRange = rangstring.Mid(nStringFrom, nStringTo - nStringFrom);
int nMid = cbMidRange.Find('-');
if (nMid == -1) {
long lPageNum = atol(cbMidRange);
if (lPageNum <= 0 || lPageNum > nCount)
return FALSE;
pageArray->push_back((FX_WORD)lPageNum);
} else {
int nStartPageNum = atol(cbMidRange.Mid(0, nMid));
if (nStartPageNum == 0)
return FALSE;
++nMid;
int nEnd = cbMidRange.GetLength() - nMid;
if (nEnd == 0)
return FALSE;
int nEndPageNum = atol(cbMidRange.Mid(nMid, nEnd));
if (nStartPageNum < 0 || nStartPageNum > nEndPageNum ||
nEndPageNum > nCount) {
return FALSE;
}
for (int i = nStartPageNum; i <= nEndPageNum; ++i) {
pageArray->push_back(i);
}
}
nStringFrom = nStringTo + 1;
}
}
return TRUE;
}
DLLEXPORT FPDF_BOOL STDCALL FPDF_ImportPages(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc,
FPDF_BYTESTRING pagerange,
int index) {
CPDF_Document* pDestDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!dest_doc)
return FALSE;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return FALSE;
std::vector<FX_WORD> pageArray;
int nCount = pSrcDoc->GetPageCount();
if (pagerange) {
if (!ParserPageRangeString(pagerange, &pageArray, nCount))
return FALSE;
} else {
for (int i = 1; i <= nCount; ++i) {
pageArray.push_back(i);
}
}
CPDF_PageOrganizer pageOrg;
pageOrg.PDFDocInit(pDestDoc, pSrcDoc);
return pageOrg.ExportPage(pSrcDoc, &pageArray, pDestDoc, index);
}
DLLEXPORT FPDF_BOOL STDCALL FPDF_CopyViewerPreferences(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc) {
CPDF_Document* pDstDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!pDstDoc)
return FALSE;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return FALSE;
CPDF_Dictionary* pSrcDict = pSrcDoc->GetRoot();
pSrcDict = pSrcDict->GetDictBy("ViewerPreferences");
if (!pSrcDict)
return FALSE;
CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
if (!pDstDict)
return FALSE;
pDstDict->SetAt("ViewerPreferences", pSrcDict->Clone(TRUE));
return TRUE;
}